POWER METER: How should the LED on the power meter blink normally during charging?

Gen 1 power meter spider:

The LED stays on when plugged in and automatically goes off when fully charged.

Gen 2 power meter spider:

① Official firmware version 40/41: After power-on, the four LEDs flash in sequence and go off when fully charged;
② Beta firmware versions 108: After power-on, all four LEDs flash simultaneously and go off when fully charged.